include/linux/sunrpc/gss_api.h

   1 /*
   2  * linux/include/linux/sunrpc/gss_api.h
   3  *
   4  * Somewhat simplified version of the gss api.
   5  *
   6  * Dug Song <dugsong@monkey.org>
   7  * Andy Adamson <andros@umich.edu>
   8  * Bruce Fields <bfields@umich.edu>
   9  * Copyright (c) 2000 The Regents of the University of Michigan
  10  */
  11
  12 #ifndef _LINUX_SUNRPC_GSS_API_H
  13 #define _LINUX_SUNRPC_GSS_API_H
  14
  15 #ifdef __KERNEL__
  16 #include <linux/sunrpc/xdr.h>
  17 #include <linux/uio.h>
  18
  19 /* The mechanism-independent gss-api context: */
  20 struct gss_ctx {
  21         struct gss_api_mech     *mech_type;
  22         void                    *internal_ctx_id;
  23 };
  24
  25 #define GSS_C_NO_BUFFER         ((struct xdr_netobj) 0)
  26 #define GSS_C_NO_CONTEXT        ((struct gss_ctx *) 0)
  27 #define GSS_C_NULL_OID          ((struct xdr_netobj) 0)
  28
  29 /*XXX  arbitrary length - is this set somewhere? */
  30 #define GSS_OID_MAX_LEN 32
  31
  32 /* gss-api prototypes; note that these are somewhat simplified versions of
  33  * the prototypes specified in RFC 2744. */
  34 int gss_import_sec_context(
  35                 const void*             input_token,
  36                 size_t                  bufsize,
  37                 struct gss_api_mech     *mech,
  38                 struct gss_ctx          **ctx_id);
  39 u32 gss_get_mic(
  40                 struct gss_ctx          *ctx_id,
  41                 struct xdr_buf          *message,
  42                 struct xdr_netobj       *mic_token);
  43 u32 gss_verify_mic(
  44                 struct gss_ctx          *ctx_id,
  45                 struct xdr_buf          *message,
  46                 struct xdr_netobj       *mic_token);
  47 u32 gss_wrap(
  48                 struct gss_ctx          *ctx_id,
  49                 int                     offset,
  50                 struct xdr_buf          *outbuf,
  51                 struct page             **inpages);
  52 u32 gss_unwrap(
  53                 struct gss_ctx          *ctx_id,
  54                 int                     offset,
  55                 struct xdr_buf          *inbuf);
  56 u32 gss_delete_sec_context(
  57                 struct gss_ctx          **ctx_id);
  58
  59 u32 gss_svc_to_pseudoflavor(struct gss_api_mech *, u32 service);
  60 u32 gss_pseudoflavor_to_service(struct gss_api_mech *, u32 pseudoflavor);
  61 char *gss_service_to_auth_domain_name(struct gss_api_mech *, u32 service);
  62
  63 struct pf_desc {
  64         u32     pseudoflavor;
  65         u32     service;
  66         char    *name;
  67         char    *auth_domain_name;
  68 };
  69
  70 /* Different mechanisms (e.g., krb5 or spkm3) may implement gss-api, and
  71  * mechanisms may be dynamically registered or unregistered by modules. */
  72
  73 /* Each mechanism is described by the following struct: */
  74 struct gss_api_mech {
  75         struct list_head        gm_list;
  76         struct module           *gm_owner;
  77         struct xdr_netobj       gm_oid;
  78         char                    *gm_name;
  79         const struct gss_api_ops *gm_ops;
  80         /* pseudoflavors supported by this mechanism: */
  81         int                     gm_pf_num;
  82         struct pf_desc *        gm_pfs;
  83 };
  84
  85 /* and must provide the following operations: */
  86 struct gss_api_ops {
  87         int (*gss_import_sec_context)(
  88                         const void              *input_token,
  89                         size_t                  bufsize,
  90                         struct gss_ctx          *ctx_id);
  91         u32 (*gss_get_mic)(
  92                         struct gss_ctx          *ctx_id,
  93                         struct xdr_buf          *message,
  94                         struct xdr_netobj       *mic_token);
  95         u32 (*gss_verify_mic)(
  96                         struct gss_ctx          *ctx_id,
  97                         struct xdr_buf          *message,
  98                         struct xdr_netobj       *mic_token);
  99         u32 (*gss_wrap)(
 100                         struct gss_ctx          *ctx_id,
 101                         int                     offset,
 102                         struct xdr_buf          *outbuf,
 103                         struct page             **inpages);
 104         u32 (*gss_unwrap)(
 105                         struct gss_ctx          *ctx_id,
 106                         int                     offset,
 107                         struct xdr_buf          *buf);
 108         void (*gss_delete_sec_context)(
 109                         void                    *internal_ctx_id);
 110 };
 111
 112 int gss_mech_register(struct gss_api_mech *);
 113 void gss_mech_unregister(struct gss_api_mech *);
 114
 115 /* returns a mechanism descriptor given an OID, and increments the mechanism's
 116  * reference count. */
 117 struct gss_api_mech * gss_mech_get_by_OID(struct xdr_netobj *);
 118
 119 /* Returns a reference to a mechanism, given a name like "krb5" etc. */
 120 struct gss_api_mech *gss_mech_get_by_name(const char *);
 121
 122 /* Similar, but get by pseudoflavor. */
 123 struct gss_api_mech *gss_mech_get_by_pseudoflavor(u32);
 124
 125 /* Just increments the mechanism's reference count and returns its input: */
 126 struct gss_api_mech * gss_mech_get(struct gss_api_mech *);
 127
 128 /* For every successful gss_mech_get or gss_mech_get_by_* call there must be a
 129  * corresponding call to gss_mech_put. */
 130 void gss_mech_put(struct gss_api_mech *);
 131
 132 #endif /* __KERNEL__ */
 133 #endif /* _LINUX_SUNRPC_GSS_API_H */
 134